Rear coil-over conversion kit for 63-72 C10 trucks with single adjustable shocks, high travel springs, and panhard bar. Looking to keep your factory truck arms, but still want coil-overs for adjustable ride height? QA1's C10 bolt-on rear suspension system is designed to convert trucks originally equipped with a coil-spring rear suspension to coil-overs. This system integrates adjustability into multiple areas so you can truly fine-tune the geometry to create the perfect performance after lowering.